<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>bootstrap</title>
    <link rel="stylesheet" href="css/bootstrap.min.css">
    <style>
    ul li{
        width: 100px;
        height: 100px;
        background: red;
    }
    #box{
        width: 300px;
        height: 300px;
        background: blue;
    }
    h1{
        background: url(img/1.webp);
        width: 500px;
        height: 300px;
    }
    </style>
</head>
<body>
<p class="text-success">这是p1</p>
<p class="bg-success">这是p2</p>
<button type="button" class="close">
    <span aria-hidden="true">&times;</span>
</button>
<span class="caret"></span>
<ul class="clearfix">
    <li class="pull-left">1</li>
    <li class="pull-left">2</li>
    <li class="pull-left">3</li>
</ul>
<div id="box" class="hidden"></div>
<div class="container">
    <div class="center-block" style="width:100px ;">1111111</div>
</div>
<div class="container">
    <a class="sr-only sr-only-focusable" href="#content">Skip to main content</a>
</div>

<h1 class="text-hide">案例</h1>
</body>
</html>